What causes a P0624 code?

P0624 can be triggered by several issues — see the verified probable causes and step-by-step diagnostics shared by mechanics and owners on OBDIY.

Can I drive with a P0624 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0624 active.

Follow the step-by-step diagnostic on this page, then read the verified fixes contributed by other Heavy Truck owners — the answer marked "Verified Cause" worked for the original poster.

OBDIY

OBD-II

P0624

Fuel Filler Cap Control Circuit Malfunction

What it means

The Engine Control Module (ECM) has detected an open, short, or out-of-range signal in the fuel filler cap indicator lamp circuit. This circuit controls the dash indicator that warns the operator if the fuel cap is not secured or the door is open.